Ouch! Did they get a goose egg from that? Broken skin? I think you 'could' take her to the doctor as concussions happen. I know that my kids in sports have each Fall a baseline concussion test. This then can be checked for the full year if there is any sort of injury to see if it is a concussion. Otherwise, you have to look for symptoms. This article you can copy and paste has a lot of info related to concussions. We looked for the signs after my son took a big head splitter in a soccer game and was put under concussion watch. https://my.clevelandclinic.org/health/diseases/15038-concussion
Hello~To be on the side of safety, i would take her to her pediatrician and let him know what is going on, he/she might want to take some x-rays to make sure all is well.
Another suggestion, take her to a chiropractor that specializes in children, most do anyway. She may have dislocated some vertebrae and that is the cause of the noise, etc. He/she will also take x-rays, study them and then go over the results.
We have a pediatric forum here, that might be another place to ask this question.